Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ba0d8acddf1b8e…

MALICIOUS

PDF

47.8 KB Created: 2020-08-31 20:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ecb76de168e6f92984499c0b0959768 SHA-1: 0012866975b550058662e5fbea5da442d066bf21 SHA-256: 61ba0d8acddf1b8e933bc1a33a030863c463c4b71a2d81a06e253e07e4ba7278
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to host or distribute further malicious content. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure. The presence of numerous external PDF links also indicates a potential link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=bpsc+online+form+last+date+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/217d68_767146622e5f4364ac7dc0dfcaa1d84d.pdf
    • https://static.usrfiles.com/ugd/585b1d_2fb3575aad304bb68f52d2882b920f79.pdf
    • https://static.usrfiles.com/ugd/4d6844_868fbdf2c6f44a808e6fee4ab9a824be.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b7fd98a56984821900bff5466b75b4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.pdf
    • https://static.usrfiles.com/ugd/21a131_a9565cbcfedb4128920d08b3dfd65e61.pdf
    • https://static.usrfiles.com/ugd/09c3c7_1b1121656d9148ae8943d87c1295c43f.pdf
    • https://static.usrfiles.com/ugd/f967ac_460dc466403144f6a98bb7f0dfcef30b.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb2cca3328cd466c88673fc95aa4b9cb.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/building_simulator_fortnite.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/99406209415.pdf
    • https://cdn.shopify.com/s/files/1/0431/7616/5536/files/vapof.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/bet_equation_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/ramewagawiluduvovobe.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89481e684a14465a2f29f9b678df186.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_44525bf620394a9e97b5f3441651136f.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b11.bin
15360ade39241137b9e5a98f61bd38f10e3248ec5ff02990006233573447078a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B11 5832 bytes
font_01_sfnt_off00008ed5.bin
afa7f6c88fc78087aa08c652ed7348ea58280863cbd2fbdaa6228e09322ee9cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED5 9796 bytes